Galvanizing apparatus.



No. 644,575. Patented Mar. 6, I900. E. l. BRADDOCK.

GALVANIZING APPARATUS.

(Application filed Nov. 14, 1899.)

(No Modal.)

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EDWARD I. BRADDOCK, OF W'INCHESTER, MASSACHUSETTS, ASSIGNOR TO THE NEWPROCESS COATING COMPANY, OF PORTLAND, MAINE.

GALVANIZING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 644,575, dated March 6,1900.

Serial No. 736,911- (No model.)

To M6 whom it may concern:

Be it known that I, EDWARD I. BRADDOOK, a citizen of the United States,residing in Winchester, in the county of Middlesex and State ofMassachusetts, have invented an Improvement in Galvanizing Apparatus, ofwhich the following description, in connection with the accompanyingdrawings, is a specification, like letters and figures on the drawingsrepresenting like parts.

This invention relates to an apparatus for galvanizing metal strips,sheets, plates, Wires, netting, &;c., and has for its object to providean apparatus with which a light, smooth, clean, and uniform coating maybe obtained at a minimum expense. For this purpose I employ an apparatuscomprising an outer vessel, a smaller inner vessel located within theouter vessel to form a continuous passage beneath said inner vesselthrough which the metal strips are passed continuously in one directionand to leave a space above it which is filled with galvanizing metal,and a partition-wall extended above the inner vessel, at one sidethereof, to separate the upper part of the outer vessel into twochambers, one of which forms an entrancechamber for the continuouspassage between said vessels and the other of which communicates withsaid passage and with the inner vessel also. The continuous passage isdesigned to contain a bath of lead or its alloys, which bath extends upinto the entrance-chamber for said passage, and the inner vessel and thechamber above it are designed to contain galvanizing metal, either zincor its alloys.

With the apparatus above described the metal strip to be galvanized isfirst passed into the bath of lead or its alloys without making contactwith the zinc, thereby avoiding waste of galvanizing metal byspattering, and is then passed out of the bath of lead and through alayer or bath of zinc or its alloys resting on the lead, thus limitingthe contact of the iron or steel strip with the zinc or its alloys, andconsequently reducing the amount of dross formed, which as itaccumulates is removed by overflowing into the inner vessel.

Figure l is a transverse section on'the line 1 1, Fig. 2, of anapparatus embodying this invention; and Fig. 2, a longitudinal sectionof the apparatus shown in Fig. 1.

The apparatus shown in the drawings comprises an outer kettle or vesseld and a smaller inner vessel j, suitably supported within the 5 5 vesseld, as by straps or hangers 10, so as to form a continuous passage hbetween said vessels and to leave a space above said inner vessel. Thevessel d is provided with a partition-wall 6, extended the length of thekettle 6o d-and downward from its upper edge for a portion only of thedepth of the said vessel to form chambers a b, the chamber a forming anentrance to the passage h and the chamber b communicating with theoutlet end of the passage h and also with the inner vessel j.

The passage h is designed to contain a bath of molten lead or its alloys4:, which fills the passage on its outlet side up to the level of theupper edge of the inner vessel j and which extends up into theentrance-chamber a above the level of the upper edge of the innervessel, due to the weight of a layer or substantially-shallow body 0 ofzinc or its alloys,

which fills the vessel j and rests on the lead in the outlet end of thepassage h, and in the present instance the zinc-bath 0 rest son aportion of the lead between the partition-wall e and the vessel j.

With the apparatus shown in the drawings the strips, sheets, &c., ofiron or steel to be galvanized, after being fiuxed, are first passedinto the entrance-chamber a and through the passage h, and by reason ofthe heavy spe cific gravity of the lead no loss of metal 00- curs byspattering or flying when the Wet iron or steel enters the molten lead,as is the case if the wet iron first passes through a layer of zincresting on the lead. The iron or steel strip, 850., continues on in itspassage through the bath of lead or its alloys and passes up. throughthe layer of zinc or its alloys resting on the lead in the outlet end ofthe passage h. The dross formed by contact of the iron vessel j. Theamount of dross through which the iron or steel strip is passed is thusreduced to a minimum, which results in the galvanized metal beingsmoother and cleaner.

The dross accumulated in the vessel j acts to automatically feed thezinc in said vessel to the chamber 1), and the said dross can be removedwithout interfering with the galvanizing process.

By means of the chamber a a very considerable saving in galvanizingmetal is effected, and by means of the overflow vessel j a superiorgalvanizing effect is permitted by the removal of the dross.

I have herein shown the partition-wall e as separate from the innervessel j,- but it is evident that it may be made as an extension of oneside of said vessel. It will be understood that the kettle or vat may beof any desired shape and size and in practice is heated to keep themetals molten.

I claim A galvanizing apparatus comprising an outer vessel, a smallerinner vessel located therein to form a continuous passage from one sideof said outer vessel to the other, and to leave a space in the outervessel above said inner vessel, and a partition-wall at one side of theinner vessel extended upward above the level of the upper edge of oneside of said inner vessel to separate the space in the outer vesselabove the inner vessel into two chambers, substantially as and for thepurpose specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

EDWARD I. BRADDOOK.

\Vitnesses:

J AS. H. CHURCHILL, J. MURPHY.

